Subsequent Events - Additional Information (Detail) - USD ($)														12 Months Ended
	Mar. 06, 2018	Mar. 05, 2018	Jan. 30, 2018	Jan. 29, 2018	Sep. 29, 2017	Jun. 30, 2017	May 17, 2017	May 16, 2017	Mar. 31, 2017	Mar. 25, 2017	Feb. 08, 2017	Feb. 07, 2017	Dec. 06, 2016	Dec. 31, 2017
Subsequent Event [Line Items]
Gross proceeds before deducting placement agent fee and offering expenses							$ 2,300,000
Cash from issuance of common stock, net of offering costs							$ 2,100,000
Warrants term														5 years
Series B 10% Convertible Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred stock, dividend rate					10.00%
Common Stock [Member]
Subsequent Event [Line Items]
Common shares issued in stock offering, net offering costs, shares														2,162,000
Private Placement [Member]
Subsequent Event [Line Items]
Common shares issued in stock offering, net offering costs, shares								85,000
Common stock, price per share								$ 1.10
Chardan [Member]
Subsequent Event [Line Items]
Common stock exercise price														$ 1.155
Percentage of warrants to purchase shares of common stock on number of shares sold														5.00%
Subsequent Event [Member] | Series B 10% Convertible Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred stock, dividend rate		10.00%
Subsequent Event [Member] | Private Placement [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Common shares issued in stock offering, net offering costs, shares	2,857,144
Common stock, price per share	$ 1.75
Subsequent Event [Member] | Offering [Member]
Subsequent Event [Line Items]
Gross proceeds before deducting placement agent fee and offering expenses	$ 5,000,000
Cash from issuance of common stock, net of offering costs	$ 4,475,000
Subsequent Event [Member] | Offering [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Common stock exercise price	$ 2.17
Subsequent Event [Member] | Chardan [Member]
Subsequent Event [Line Items]
Common stock exercise price	$ 2.365
Percentage of gross proceeds of offering	8.00%
Percentage of warrants to purchase shares of common stock on number of shares sold	3.00%
Warrants term	5 years 6 months
Andrew Arno [Member] | Private Placement [Member]
Subsequent Event [Line Items]
Common shares issued in stock offering, net offering costs, shares								50,000
Common stock, price per share								$ 1.10
Secured Promissory Note [Member] | Steven L. and Monique P. Elfman [Member]
Subsequent Event [Line Items]
Notes due date						Sep. 25, 2017					Mar. 24, 2017			Mar. 24, 2017
Debt instrument extended maturity date						Feb. 11, 2018			Jun. 23, 2017
Secured Promissory Note [Member] | Steven L. and Monique P. Elfman [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Notes due date			Feb. 11, 2018	Aug. 18, 2017
Secured Promissory Note [Member] | William W. Smith, Jr. and Dieva L. Smith [Member]
Subsequent Event [Line Items]
Notes due date						Sep. 25, 2017						Mar. 24, 2017	Dec. 14, 2016
Debt instrument extended maturity date						Jul. 25, 2018				Jun. 26, 2017
Secured Promissory Note [Member] | William W. Smith, Jr. and Dieva L. Smith [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Notes due date			Jul. 25, 2018	Jun. 26, 2017
Debt instrument extended maturity date		Mar. 25, 2020
Secured Promissory Note [Member] | Next Generation TC FBO Andrew Arno IRA 1663 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Notes due date			Jul. 25, 2018	Aug. 24, 2017
Debt instrument extended maturity date		Mar. 25, 2020
Secured Promissory Note [Member] | Andrew Arno [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Notes due date			Jul. 25, 2018	Aug. 24, 2017
Debt instrument extended maturity date		Mar. 25, 2020